Seiko Cal. 5640 - 724

This Solar model from 1988 features a 43mm Gold-Plated case. The Fixed bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-cfc3ab2ebb88]

Also known as: Sumo, Emperor

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Black

Jewels

28j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1988

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